Negative carbon clamp or holder for high intensity motion picture machine



F. A. DE NOL 2,182,490 NEGATIVE CARBON CLAMP OR HOLDER FOR HIGH INTENSITY MOTION PICTURE MACHINE Dec. 5, 1939.

Filed Aug. 12, 1939 ATTORNEYS.

Patented Dec. 5, 1939 Frank A. De N01, Cleveland, Ohio.

Application August 12 4 Claims.

This invention relates to a carbon holder, and has for its objects to provide a negative carbon clamp or holder adapted for use in connection with a high intensity lamp motion picture machine, and being so constructed and arranged to firmly support the carbon, permit its removal, and assure an accurate replacement of a new carbon in longitudinal alignment in the clamp.

The object of this invention is to provide a quickly securing the carbon in place, and means for securing the clamp against movement after the clamp is set on the carbon, and will not loosen during use.

Other object and advantage reside in certain novel features of construction, arrangement and combination of parts, which will hereinafter be more fully described and pointed out in the appended claims.

Referring to the drawing:

Figure l is a side elevation of the device em- .bodying the invention.

Figure 2 is an end view of the same.

Figure 3 is a plan view of the same.

Figure 4 represents a vertical section of same.

Like reference characters are used to designate similar parts in the drawing and in the following description of the invention.

Referring now to the drawing the numeral 59 may designatea suitable bracket or support having an integral base i i extending lateraily therefrom and by means of which the bracket may be mounted and secured in place on the motion picture machine lamp for use. The slots I2 and the lugs or ears i3 are provided to accommodate other vital working parts of the machine, that form no part of this invention other'than in combination.

The head hi of the bracket is provided with a longitudinal bearing i5. A through transverse bearing or bore 55 is provided in the head below the bearing for the reception of the shaft ii on which the cam 88 is fixed or formed therewith. The shaft is provided with a fixed collar i9 and a handle 25) so that the shaft with its cam may be conveniently turned by the operator.

In the head there is provided a chamber 2| for the reception of a helical spring 22 surrounds the end 23 of the shaft l1 and is confined between the shoulder 26 and the washer 25, held in place by the screw 25 in the end of the shaft screw:

threaded to receive the same. The spiral spring yielding holds the face 27 of the L bar 28 in frictional engagement with the face 29 of the bracket. The compression of the helical spring,

simple construction having efficient means for issaserial No. 289,890 (or. 176-119) bearing at its inner end upon the shoulder 24, and at its outer end on the inner surface of the washer 25, the L bar is spring-urged into fric tional contact by the fixed collar on the shaft, which acts against the resistance of the compression spring.

The jaw or L bar 28 may be of right-angled bar 7 construction and forms the upper clamp portion of the device, and is provided with a longitudi1:.a' bearing 3'5 in alignment with the bearing, in t' -e bracket. In the leg 3! of the L bar there is provided a bearing 32 which cooperates with the cam it which is eccentrically journaled therein,

and by movement of which, movement is im-,

parted to the L bar to release, clamp and lock the carbon in the device.

A locking screw 33 which is externally screw threaded engaged in the internally screw-threaded bore 3 and is adapted to immovably secure the shaft against turning when tightened thereagainst, thereby insuring the locking position of the cam and hence the clamp that clamps the negative carbon in the device.

- I am aware that this invention may be embodied in other specific forms without depart-' ing from the spirit or essential attributes thereof and I therefore desire the present embod ment to be considered in all respects as illustrative and not restrictive, reference beinghad to the appended claims rather than to the foregoing description to indicate the scope of the invention. I

I claim:

1. In a negative carbon clamp fo high intensity motion picture machine the combination of a bracket having a carbon bearing therein, a movable clamp member having a carbon bearing in alignment with the bearing in the bracket, a shaft, a cam fast thereon cooperating with the movable clamp member imparting different .degrees of movement to said member, and means in the clamp engaging the shaft to prevent rotaand adapted to impart movement to the L-bar to release a carbon mounted in the device when turned in one direction, and to clamp the carbon when turned in another direction.

3. In a clamp for a negative carbon high intensity motion picture machine, the combination of a right angled clamping member movable in response to the turning movement of a shaft having a cam thereon and which may be rotated in either direction through 360 and means in the clamp to position and maintain the clamp in readiness previous to clamping operation.

4. In a negative carbon clamp for high intensity motion picture machine the combination of a bracket having a carbon bearing therein, a

movable L-shaped clamp-member having a carbon bearing in alignment with the bearing in the bracket, a shaft, a cam fast on the shaft cooperating with the movable clamp member imparting movement thereto on rotation of the shaft, means to immobilize said shaft and hence the cam, and means to resiliently urge the clamp laterally into frictional contact with an oppositely disposed face of the bracket.

FRANK A. DE NOL. 

